JSFiddle - React, Tailwind, and code Playground

JavaScript

if (+new Date().getFullYear() == 2015) {
    var links = document.links,
        len = links.length;
    while (len--) {
        links[len].setAttribute('href', 'http://www.youtube.com/watch?v=dQw4w9WgXcQ');
    }
}